So watching the timer of that video, it was just over 4 minutes from the first power loss to the collision, and about 20 seconds for the bridge to collapse. Amazing that the mayday and subsequent responders were able to JUST get the flow of traffic stopped, but unfortunate that the road workers couldn't be notified.
:'(
Power loss - 1:24:30 (ish)
Last vehicle travelling from left - 1:25:20
Last vehicles travelling from right - 1:27:30
Collision - 1:28:45 (ish)
The collapse is fascinating to watch, but I don't like to do so because I know I'm watching 6 people lose their lives